ExprNumberSetWildcard.java

/*
 * *************************************************************************************
 *  Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 *  http://esper.codehaus.org                                                          *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 * *************************************************************************************
 */

package com.espertech.esper.epl.expression;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.type.WildcardParameter;

import java.util.Map;

/**
 * Expression for use within crontab to specify a wildcard.
 */
public class ExprNumberSetWildcard extends ExprNodeBase implements ExprEvaluator, ExprNumberSetWildcardMarker
{
    private static final WildcardParameter wildcardParameter = new WildcardParameter();
    private static final long serialVersionUID = -6098833102154556698L;

    public String toExpressionString()
    {
        return "*";
    }

    public ExprEvaluator getExprEvaluator()
    {
        return this;
    }

    public boolean isConstantResult()
    {
        return true;
    }

    public Map<String, Object> getEventType() {
        return null;
    }

    public boolean equalsNode(ExprNode node)
    {
        return node instanceof ExprNumberSetWildcard;
    }

    public void validate(ExprValidationContext validationContext) throws ExprValidationException
    {
    }

    public Class getType()
    {
        return WildcardParameter.class;
    }

    public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext)
    {
        return wildcardParameter;
    }
}